Summary: The following article is a part of National Board
Classic Series.

The following instrument readings, as appropriate to the specific boiler
system, need to be taken daily for low-pressure heating boilers and at least
once per eight-hour shift for high-pressure boilers. These readings must be
recorded in the boiler log.

NOTE: It is very important that the boiler log be kept in a consistent format,
in order for trends to be perceived and followed with preventive action.
Standard forms are available for this purpose; however, the log may be more
useful if the log form is customized for the particular installation.

GENERAL

Air compressor, control pressure (psig)

Outdoor air temperature (degrees F)

City water supply pressure (psig)

BOILER

Boiler(s) in service

Fuel in use

Operating time (hours)

Operating cycles(number)

Amount of fuel on hand

Boiler water level (normal, low, high)

Firing level (rate)

Flame condition (observed)

Boiler pressure (psig)

Boiler water temperature, hot water (degrees F)

Stack temperature, net (degrees F)

GAS FUEL

Pilot gas pressure (inches WC)

Burner gas pressure (ounces/square inch or psig)

Gas used (cubic feet)

OIL FUEL

Oil pump in service

Vacuum at oil pump (inches Hg)

Oil pressure at pump (psig)

Oil pressure at burner (psig)

Oil pressure at regulating valve (psig)

Atomizing medium pressure, air, steam (psig)

CONDENSATE SYSTEM (steam boilers)

Boiler feed pump in service

Condensate return temperature (degrees F)

Water level in condensate tank (normal, low, high)

Make up water rate (gallons)

FORCED HOT WATER CIRCULATION SYSTEM

Circulating pumps in service

Return water temperature (degrees F)

Water level in expansion tank (normal, high, low)

BOILER WATER TREATMENT

Level of chemicals in treatment tank

Treatment pump in service (low, normal)

Boiler water samply taken

MAINTENANCE OR REPAIR OPERATIONS

These operations should be recorded in the log

Editor's note: Some ASME Boiler and Pressure Vessel Code
requirements may have changed because of advances in material
technology and/or actual experience. The reader is cautioned to refer
to the latest edition and addenda of the ASME Boiler and Pressure Vessel Code for current requirements.